<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 提示区 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>
      <!-- 步骤条 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      
      <!-- tab栏区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs :tab-position="'left'"  v-model="activeIndex" :before-leave = "beforeTabLeave" @tab-click="tabClicked">
            <el-tab-pane label="基本信息" name="0">
                <el-form-item label="商品名称" prop="goods_name">
                    <el-input v-model="addForm.goods_name"></el-input>
                </el-form-item>
                <el-form-item label="商品价格" prop="goods_price">
                    <el-input v-model="addForm.goods_price" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品重量" prop="goods_weight">
                    <el-input v-model="addForm.goods_weight" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品数量" prop="goods_number">
                    <el-input v-model="addForm.goods_number" type="number"></el-input>
                </el-form-item>
                <el-form-item label="商品分类" prop="goods_cat">
                    <el-cascader v-model="addForm.goods_cat" :options="catelist" expand-trigger="hover" :props="cateProps"
                                 @change="handleChange">
                    </el-cascader>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" name="1">
                <!-- 渲染表单的Item项 -->
                <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                    <!-- 复选框组 -->
                    <el-checkbox-group v-model="item.attr_vals">
                        <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
                    </el-checkbox-group>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
                <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id" border>
                     <el-input v-model="item.attr_vals"></el-input>
                </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name="3">
                <!-- action 表示图片要上传的后台api 地址 -->
                <el-upload action="https://www.liulongbin.top:8888/api/private/v1/upload" :on-preview="handlePreview" :on-remove="handleRemove"
                            list-type="picture" :headers = "headerObj" :on-success= "handleSuccess">
                      <el-button size="small" type="primary">点击上传</el-button>
                </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">
                <!-- 富文本编辑器组件 -->
                <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                <!-- 添加商品的按钮 -->
                <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
            </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
        <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>

  </div>
</template>

<script>
import _ from 'lodash'

export default {
  data() {
    return {
      activeIndex: '0',
      //添加商品的表单数据对象
      addForm: {
          goods_name:'',
          goods_price: 0,
          goods_weight: 0,
          goods_number: 0,
          //商品所属的分类数组
          goods_cat:[],
          //图片的数组
          pics:[],
          //商品的详情描述
          goods_introduce: '',
          attrs: []

      },
      addFormRules:{
          goods_name:[
              { required: true, message: '请输入商品名称', trigger: 'blur' }
          ],
          goods_price:[
              { required: true, message: '请输入商品价格', trigger: 'blur' }
          ],
          goods_weight:[
              { required: true, message: '请输入商品重量', trigger: 'blur' }
          ],
           goods_number:[
              { required: true, message: '请输入商品数量', trigger: 'blur' }
          ],
          goods_cat:[
              { required: true, message: '请xuanze商品分类', trigger: 'blur' }
          ],
      },
      catelist: [],
      cateProps:{
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      //动态参数列表数据
      manyTableData:[],
      //静态属性列表数据
      onlyTableData:[],
      //图片上传组件的headers请求头对象
      headerObj:{
          Authorization: window.sessionStorage.getItem('token')
      },
      previewPath:'',
      previewVisible: false

    };
  },
  created() {
      this.getCateList()
  },
  methods: {
      //获取所有商品分类数据
      async getCateList(){
           const {data : res} = await this.$http.get(`categories`);
           if(res.meta.status !== 200){
               return this.$message.error('获取商品分类数据失败！')
           }
           this.catelist = res.data;
           console.log(this.catelist)
      },
      //级联选择器选择项发生变化，触发这个函数
      handleChange(){
          console.log(this.addForm.goods_cat);
          if(this.addForm.goods_cat.length !==3){
              this.addForm.goods_cat = [];
          }
      },
      beforeTabLeave(activeName, oldActiveName){
        //    console.log('即将离开的标签页的名字是：' + oldActiveName);
        //    console.log('即将进入的标签页的名字是：' + activeName);
        //    return false
        if(oldActiveName === '0' && this.addForm.goods_cat.length !==3){
            this.$message.error('请先选择商品分类！')
            return false
        }
      },
      async tabClicked(){
        //   console.log(this.activeIndex)
        //this.activeIndex === '1',证明访问的是商品参数面板
        if(this.activeIndex === '1'){
            const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                params:{sel: 'many'}
            })

            if(res.meta.status !== 200){
                 return this.$message.error('获取动态参数列表失败！')
            }
            //console.log(res.data);
            res.data.forEach(item => {
               item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
            });
            this.manyTableData = res.data;
        } else if(this.activeIndex === '2'){
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                          params:{sel: 'only'}
                })
                if(res.meta.status !== 200){
                return this.$message.error('获取静态属性失败！')
                }
                console.log(res.data);
                this.onlyTableData = res.data;
        }
      },
      //处理图片预览效果
      handlePreview(file){
          console.log(file);
          this.previewPath = file.response.data.url;
          this.previewVisible = true;


      },
      //处理移除图片的操作
      handleRemove(file){
          console.log(file);
          //1.获取将要删除图片的临时路径
          const filePath = file.response.data.tmp_path
          //2.从pics数组中找到这个图片对应的索引值
          const i = this.addForm.pics.findIndex(x => 
          x.pic === filePath)
          //3.调用数组的splice 方法，把图片信息对象从pics数组中移除
          this.addForm.pics.splice(i,1);
          console.log(this.addForm);

      },
      //监听图片上传成功的事件
      handleSuccess(response){
          console.log(response);
          //1.拼接得到一个图片信息对象
          const picInfo = {pic: response.data.tmp_path}
          //2.将图片信息对象，push 到pics数组中
          this.addForm.pics.push(picInfo);
          console.log(this.addForm)
      },

      //添加商品
       add(){
          this.$refs.addFormRef.validate(async valid => {
              if(!valid){
                  return this.$message.error('请填写必要的表单项！')
              }
              //深拷贝 lodash cloneDeep(obj)
              const form = _.cloneDeep (this.addForm)
              //执行添加的业务逻辑
              form.goods_cat = form.goods_cat.join(',');
              //处理动态参数
              this.manyTableData.forEach( item => {
                  const newInfo = {attr_id: item.attr_id,
                  attr_value: item.attr_vals.join(' ')};
                  this.addForm.attrs.push(newInfo)
              })
              //处理静态属性
              this.onlyTableData.forEach( item => {
                  const newInfo = {attr_id: item.attr_id,
                  attr_value: item.attr_vals};
                  this.addForm.attrs.push(newInfo)
              })
              form.attrs = this.addForm.attrs;
              console.log(form);
              //发起请求添加商品
              //商品的名称必须是唯一的
              const {data: res} = await this.$http.post('goods',form);
              console.log(res);
              if(res.meta.status !== 201){
                  return this.$message.error('添加商品失败！')
              }
              this.$message.success('添加商品成功！');
              this.$router.push('/goods');
          })
      }
     
      
  },
  computed:{
      cateId(){
          if(this.addForm.goods_cat.length ==3){
              return this.addForm.goods_cat[2]
          }
          return null
      }
  }
};
</script>

<style scoped>
.el-checkbox {
   margin: 0 10px 0 0 !important;
}

.previewImg{
    width: 100%;
}

.btnAdd{
    margin-top: 15px;
}

</style>